Devaka Cooray

Marshal
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since Jul 29, 2008
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Forum Moderator

Devaka started programming with Pascal and BASIC languages when he was 13, and he has been coding with Java since 2003. Devaka got his bachelor's in computer science from the University of Moratuwa, and currently holds SCJP, SCWCD, and SCBCD certifications. He is mostly known as the author of ExamLab , which is a popular exam simulator for SCJP certification.
When he is not wrangling with his JavaEE and enterprise projects, he likes to play with sneaky web application security stuff.
More about Devaka can be found at his website http://www.devakacooray.com/
Devaka was made a Bartender in 2010, was promoted to Sheriff in 2015 , and was made a Marshal in 2015 Email
Moratuwa, Sri Lanka
Cows and Likes
Cows
Total received
796
In last 30 days
4
Total given
617
Likes
Total received
934
Received in last 30 days
8
Total given
1113
Given in last 30 days
4
Scavenger Hunt
(keep public parts private until JForum day)
expand Ranch Hand Scavenger Hunt
expand Greenhorn Scavenger Hunt
Moderation Tools

Recent posts by Devaka Cooray

Here is a list of new features we have:

  • Liutauras - electricity made 178% efficient by replacing fluorescent bulbs with incandescent bulbs in cabin 12
  • Jeanne - fine-tune the lorentz force in the main z-pinch system
  • Devaka - more quantum detectors installed to capture remote brainstem activities
  • Jeanne - reworked the AI of HAL 9000
  • Devaka - lava routed to a lower level, opening up three more bunk rooms for henchmen
  • Devaka - temporary jump jets added to escape pod 7
  • Devaka - add one photon cannon to the runabout
  • Devaka - primary weapon made 4% more efficient
  • Devaka - added to level 5 diagnostic for long range sensors
  • Devaka - replaced some of the polymer solar cells with organic solar cells
  • Devaka - Fix bug where adding affiliate code didn't work on direct purchase links
  • Devaka - Fix bug where the attachment tab failed to show attachments when the description part contains quotes
  • Devaka - Premium thread gifts support physical goods
  • Devaka - Feature to specify thread boost duration in days or months

2 weeks ago
As discussed on email, I just removed the invalid email flag on your account.
1 month ago
Greenhorn
When you first sign up you are automatically given the rank of greenhorn. You have to earn the title of Ranch Hand!

Ranch Hand
After your 30th post the forum software automatically upgrades your rank to that of Ranch Hand.  This is the last automatic rank change.

Ranch Foreman
Ranch Foremans are recognized as the most productive non-moderator members on Coderanch. At any given time, there may be up to (a total of) seven Ranch Foremans (and Master Ranchers), whom are chosen every month, by Gir Bot -- who is a rather limited, but automated, software bot buried deep within the bowels of the ranch's forum software. Frequently promoted Ranch Foremans are also candidates to be promoted to Bartender by the Trail Boss.

Rancher
On occasion we manually offer members a Rancher title mostly because we feel like it. There is no criteria or benefit to this title, it gets applied if and when any staff member feels like it.

Master Rancher
Master Ranchers are recognized as the most productive Ranchers on Coderanch. At any given time, there may be up to (a total of) seven Master Ranchers (and Ranch Formans), whom are chosen every month, by Gir Bot. Frequently promoted Master Ranchers are also candidates to be promoted to Bartender by the Trail Boss.

Author
Authors are folks that have written a book.

 
Bartender
This is the first staff title. Bartenders are people that have been recognized as generous, decent, helpful people and given the keys to a forum to do moderating as they see fit. They can edit, delete, or prune any posts in their forums. If you have a question about a particular forum, you should direct it to (one of) the forum's bartender(s).
 
Saloon Keeper
Saloon Keepers are recognized as the most productive Bartenders on Coderanch. At any given time, there are five Saloon Keepers, whom are chosen every month, by Gir Bot. Frequently promoted Saloon Keepers are also candidates to be promoted to Sheriff by the Trail Boss.
 
Sheriff
Sheriffs are Bartenders (also commonly frequent Saloon Keepers) that have been recognized as being so generous, decent and helpful, that they have been given the keys to all of the forums and most of the rest of Coderanch.
 
Marshal
Marshals are recognized as the most productive Sheriffs on the JavaRanch. At any given time, there are five Marshals, whom are also chosen every month, by Gir Bot.
 
Marshal Commander
The Trail Boss picks one Marshal from time to time as someone who is most likely to be able to jump on issues as they come up.

 
Trail Boss
Paul Wheaton.  'Nuff said.




Some people have donated a big heap to JavaRanch and we let them pick their own custom title.  If you'd like to pick your own custom title, check out the Tip Jar.



Why have greenhorn and ranch hand?

We want strangers to the ranch to feel welcome and the best way to make them feel welcome is to recognize them and say, "Howdy!"  The greenhorn title lets us recognize the new ranch hands.  Greenhorn has nothing to do with Java knowledge.

Why don't you have more automatic titles when a person posts 100 times or 1,000 times?

Now that we've changed to new forum software, we might look at adding some more automatic titles.


CategoryJForum
1 month ago
It's a bit hard to see what exactly happened back in 2014, but it looks like one of the emails that we sent to you got bounced.

I just sent you an email. Can you please reply to it?
1 month ago
Take a look at some of the new features we have on Coderanch right now:

  • Devaka - fine-tune the lorentz force in the main z-pinch system
  • Devaka - Make the link option be the primary way to buy gifts
  • Devaka - Improve the UI of the page after purchasing a premium thread gift
  • Devaka - Feature to email premium thread gifts to anyone
  • Devaka - Make premium thread gifts work on mobile view
  • Devaka - Properly show the seller name of premium threads in mobile view
  • Devaka - Fix quote tag layout bugs
  • Devaka - connect more solar cells to the undervolt main B bus
  • Devaka - Make the #premium anchor go to the premium content instead of the post containing the premium content
  • Devaka - increase the magnetic field intensity of the primary cyclotron
  • Devaka - safety cover installed over self destruct button
  • Devaka - alligator pit trap door mechanism adjustment
  • Devaka - shielded the primary shuttle from the messier 83 gamma ray burst
  • Jeanne - Migrate user profile edit page to new look and feel
1 month ago

Campbell Ritchie wrote:What temperature is the carbonite freezer set to now?


It's −273.14999 °C right now.
1 month ago
We just deployed a new release of the forum software. Here is what it contains:

  • Devaka - re-calibration of the carbonite freezer
  • Devaka - upgrade aft shields
  • Devaka - Display recent posts on user profiles
  • Devaka - robot goat army finally has actual targeting so THAT won't happen again
  • Jeanne - add number views to mobile view.
  • Devaka - Fix bug where view count was not properly updating on the second page of threads
  • Jeanne - Clarify language on which name(s) to provide when winning a book if CodeRanch name is not legal name.
  • Jeanne - Mark your own posts as read automatically in recent topics list
  • Devaka - added to level 5 diagnostic for long range sensors
  • Devaka - primary weapon made 4% more efficient
  • Devaka - For every thread for a non-logged-in-user, there is exactly one link for each author to their user page
  • Devaka - bring the flux capacitor online
  • Devaka - safety cover installed over self destruct button
  • Devaka - refill the main wetwell suppression pools
  • Devaka - boost the main engine thrust by a magnitude of 3.14
  • Devaka - fix the broken vacuum beam lines in the primary electrostatic nuclear accelerator
  • Devaka - Fix bug where recent threads in the user profile were overlapping with youtube videos
  • Devaka - reset the dart launchers in the cave labyrinth
  • Devaka - alligator pit expansion
  • Tim M - add and update several javadoc links, especially for Java SE 9
  • Jeanne - have gir bot post updates to cow polls
  • Andrew - completed another round of 3C273 quasar flyby
  • Frits - refilled the main beta particle emitter with copper-64 isotope
  • Frits - lava routed to a lower level, opening up three more bunk rooms for henchmen
  • Devaka - fine-tune the lorentz force in the main z-pinch system
  • Devaka - corrected a 5.39x10⁻⁴⁴ seconds offset found in the main atomic clock
  • Jeanne - donuts cleared out of torpedo tube 3 so we don't get ants
  • Devaka - add one photon cannon to the runabout
  • Devaka - shark tank trap door mechanism adjustment
2 months ago
We just deployed a new version of the forum software. Here is what it contains:

  • Devaka - New interface for the banner tracker page
  • Devaka - dilithium crystal calibration
  • Devaka - shark tank expansion
  • Devaka - bring the flux capacitor online
  • Devaka - connect more solar cells to the undervolt main B bus
  • Devaka - Show unique and solo IP clicks / CTR on the banner tracker page
  • Devaka - found the droids we were looking for
  • Devaka - shielded the primary shuttle from the messier 83 gamma ray burst
  • Devaka - rewire cabin 12 to facilitate a hologram projector
  • Devaka - Various minor fixes and improvements to banners
  • Frits - cleaned that weird goo out of transporter room 2
  • Andrew - upgrade aft shields
  • Jeanne - undocked the command module from the secret mission module
  • Devaka - strengthen the intensity of main ultrasonic transducers
  • Knute - corrected a 5.39x10⁻⁴⁴ seconds offset found in the main atomic clock
  • Tim M - updated Guava and OSGi javadoc URLs
  • Devaka - increase the magnetic field intensity of the primary cyclotron
  • Devaka - Paypal based authentication for guest payments
  • Devaka - Prevent users from accidentally double-purchasing premium threads
  • Devaka - Fix bug where premium thread gifts didn't work in guest mode
2 months ago
Here are some new features and fixes from the new release of the forum software which we have just deployed:

  • Devaka - undocked the command module from the secret mission module
  • Liutauras - robot goat army finally has actual targeting so THAT won't happen again
  • Devaka - electricity made 178% efficient by replacing fluorescent bulbs with incandescent bulbs in cabin 12
  • Devaka - New pie feature: custom profile URL
  • Devaka - New thread boost feature: custom URL for a thread
  • Jeanne - upgrade aft shields
  • Devaka - Improve the page after sign up
  • Devaka - New and improved sign up / login page
  • Devaka - increase the magnetic field intensity of the primary cyclotron
3 months ago
We just deployed a new version of the forum software. Here is what's new on this new release:

  • Devaka - temporary jump jets added to escape pod 7
  • Devaka - dilithium crystal calibration
  • Devaka - improve the water cooling system
  • Devaka - cleaned that weird goo out of transporter room 2
  • Devaka - fix the broken vacuum beam lines in the primary electrostatic nuclear accelerator
  • Devaka - undocked the command module from the secret mission module
  • Tim M - updated several javadoc URLs
  • Devaka - more quantum detectors installed to capture remote brainstem activities
  • Devaka - In thread boost page, show the status of inactive thread boost features
  • Devaka - boost the main engine thrust by a magnitude of 3.14
  • Tim M - alligator pit trap door mechanism adjustment
  • Tim M - alligator pit expansion
  • Frits - found the droids we were looking for
  • Devaka - add one photon cannon to the runabout
  • Devaka - fishing the gross goo out of the carbonite freezer after a boo-boo
  • Devaka - main engine reconnected to another electron pump
  • Liutauras - increase the magnetic field intensity of the primary cyclotron
  • Frits - donuts cleared out of torpedo tube 3 so we don't get ants
  • Devaka - refilled the main beta particle emitter with copper-64 isotope
  • Devaka - robot goat army finally has actual targeting so THAT won't happen again
  • Devaka - connect more solar cells to the undervolt main B bus
  • Devaka - added to level 5 diagnostic for long range sensors
  • Devaka - shielded the primary shuttle from the messier 83 gamma ray burst
3 months ago
Here is a list of new features included in the new version of the forum software that we just deployed.

  • Andrew - cleaned that weird goo out of transporter room 2
  • Liutauras - boost the main engine thrust by a magnitude of 3.14
  • Devaka - Thread boost different styles for auto-links
  • Devaka - Different priorities for DX5 ads
  • Devaka - rewire cabin 12 to facilitate a hologram projector
  • Devaka - add more boron control rods to the secondary nuclear reactor
  • Devaka - connect more solar cells to the undervolt main B bus
  • Liutauras - main engine reconnected to another electron pump
  • Devaka - Users can watch another user
  • Devaka - fishing the gross goo out of the carbonite freezer after a boo-boo
  • Devaka - temporary jump jets added to escape pod 7
  • Andrew - re-calibration of the carbonite freezer
4 months ago
Mock Exam List

The following is a list of sample mock exams for the Sun Certified Java Programmer Exam (SCJP and OCPJP). Please check with Sun's site for the latest SCJP exam objectives, and other related information here. Also, check out our popular SCJP certification FAQ at ScjpFaq.

In addition to this list, Oracle posted sample questions

No.Mock ExamsNo. of QstnsComments
1The JavaRanch Rules Round-up Game144This is a very simple set of questions that tests basic Java language rules by asking mostly yes/no questions. You should be scoring 100% on this exam before taking the actual SCJP2 exam.
2The new and improved JavaRanch Rules Round-up Game 144Give 'er a looksie and let Marilyn know what ya think.
3ExamLab360A professional web-based SCJP/OCPJP exam simulator for free. Contains answers and in-depth explanations making it easy to understand new concepts. Simulates the user-interface of the real exam
4CertPal210SCJP 1.5 and 1.6 exams are available here
5Free scjp 1.5 & 1.6 questions 55Collection which grows with time.
6Marcus Green's mock exams 1, 2, 360 eachMarcus Green has composed 3 mock exams in .html format. The exams are mentioned often in the SCJP certification forum.
7ISBN 0072260882 OCP Java SE 6 Programmer Practice Exams260Written by two of the lead developers of the Java SE Programmer Exam, OCP Java SE 6 Programmer Practice Exams is filled with more than 260 realistic practice questions to prepare you for this challenging exam. To help you understand this material, in-depth explanations of both the correct and incorrect answers are included for every question.
8Valiveru's mock exam60+Good questions.
9Mughal & Rasmussen's mock exam engine17The questions are HARDER than the real SCJP2 Exam from Sun. So if you take this test and get low scores, don't be upset. Their 'Java Certification Book' is often praised by not just programmers studying for the SCJP2, but Java programmers in general. The authors do not directly provide the answers to the mock exam. You have to be tricky to get the answers. Just answer 1 question at a time and end the exam and see the results. If you get 1/59 correct, it means that your answer is correct; otherwise it was wrong.
114Tests.com40The questions look good. Definitely worth taking at least once.
12Sahir's TestCafe MockTest100Provides 10 questions under each SCJP objective.
13eJavaGuru11Focused on Enums for SCJP 5.0. Excellent explanations of answers to clarify fundamentals.
14JavaBeat for SCJP 6
15Skill Guru56 + 63Mock tests for SCJP 5 and 6, SCBCD as well as other subjects
16SCJP 5 Preparation76Tips, Tricks & FAQs for SCJP 1.5
17Whizlabs.com72Free Diagonostic Exam for SCJP 5.0 & 6.0 with full report.
18SCJP mock exams online400Free online SCJP 6.0 mock exam with reports and statistics. Exam questions are updated permanently.
19Niko's SCJP Mock Questions450More then 450 Questions for SCJP 1.5 and 1.6 divided into topics.
20JavaChamp.com SCJP 6 mock exams470Top quality SCJP mock exams, publish your certification score online in your public profile, add the permalink of your public profile to your resume or your blog/web page example profile, Find Study-Mates, Coaches or Trainees, Download PDF books in SCJP, SCEA, JPA, EJB, JMS, Design Patterns


Commercial Mock Exams

This list does not constitute an endorsement by JavaRanch; it's simply a service to our visitors. Vendors are free to list their products, but please stick to the basic facts and keep the marketing-speak out of it.

Company/ProductCostTotal questionsComments
ExamLabUSD 6.0 (OR wait for 7 days)360A professional web-based SCJP/OCPJP exam simulator containing answers and in-depth explanations making it easy to understand new concepts. Also it simulates the user-interface of the real exam giving you more comfort at the exam. Diagnostic exam is free, and for other exams you have to pay USD 5 OR wait for 7 days
Whizlabs Java Certification (SCJP) KitsUSD 49.95580+The kit contains 6 full length simulated mock exams and interactive quiz (over 580 questions) on the real exam pattern. The advanced features include Adaptive Testing, Intelligent Reporting, In-depth Customization, Exhaustive Explanations, Printing, Question Bookmark, and Feedback. Free demo available.
SCJP 5.0 Exam EPractize LabsUSD 37.80566SCJP 5.0 Exam EPractize Labs – This study guide simulator covers the following features for preparing SCJP 5.0 (both full and upgrade exam): Review Tips, Examples and Development, Interactive Quiz Exam, Mock Exams based on levels - Beginner, Intermediate and Expert, Focus Lab. There's also a free trial version.
Enthuware for SCJP 1.6, 1.7, and 1.8USD 18 or Indian Rs.650792792 questions of varying toughness, Detailed explanations, Questions on all the concepts from JLS, Highly Customizable, very similar to actual SCJP Questions, free online support. The User Interface (including Drag and Drop style questions) is closer to the real exam than any other s/w in the market. It allows you to print, take notes, store study material (stuff that you might find on the internet such as pdf document, images, or any other file), and add helpful URLs. There's also a free trial version.
uCertifyUSD 79.98565for SCJP 1.6; 30 demo questions available for free
JavaBeatUSD 7 or Indian Rs. 200350There is 350 SCJP 1.5 practice questions with various level of testing the competencies. The questions are categorized into objectives to help specialize in specific topic. JavaBeat provides questions in the eBook format(PDF).
JavaBeatUSD 10 or Indian Rs. 250400for SCJP 1.6





CategoryCertification ScjpFaq
4 months ago
We just deployed a new version of the forum software. Here's what it includes:

  • Devaka - Fix CSS bug in wiki comments (hot-patched to permies)
  • Liutauras - upgrade aft shields
  • Devaka - Premium thread gifts feature
  • Devaka - Feature to purchase things without being logged in
  • Devaka - re-calibration of the carbonite freezer
  • Devaka - added to level 5 diagnostic for long range sensors
  • Devaka - Increase the font size of the similar threads 'more' link (hot-patched)
  • Liutauras - shark tank expansion
  • Liutauras - Flags can be added to topic by pressing 'enter' too, not just button 'Add flag(s)'
  • Devaka - Users can buy premium thread gifts for others without logging in
  • Devaka - When a user who made a guest payment attempts to sign up, automatically fill in the sign up form
  • Liutauras - alligator pit trap door mechanism adjustment
  • Devaka - Fix bug where in similar thread lists, premium threads were not linked
  • Liutauras - donuts cleared out of torpedo tube 3 so we don't get ants
  • Devaka - Users can buy premium thread gifts for others in the form of a shareable link
  • Devaka - alligator pit expansion
  • Liutauras - found the droids we were looking for
  • Devaka - lava routed to a lower level, opening up three more bunk rooms for henchmen
  • Liutauras - completed another round of 3C273 quasar flyby
  • Devaka - refill lithium deuteride in the external pulsed plasma propulsion
  • Devaka - When someone makes a guest payment for a premium thread, redirect the user to that thread after sign up or log in
  • Devaka - undocked the command module from the secret mission module
  • Devaka - When a guest user accepts a premium thread gift or invitation, redirect the user to the thread after sign up or log in
  • Devaka - fine-tune the lorentz force in the main z-pinch system
  • Devaka - shielded the primary shuttle from the messier 83 gamma ray burst
4 months ago
We just deployed a new version of the forum software, which includes these new stuff:

  • Devaka - cleaned that weird goo out of transporter room 2
  • Devaka - reworked the AI of HAL 9000
  • Liutauras - donuts cleared out of torpedo tube 3 so we don't get ants
  • Liutauras - electricity made 178% efficient by replacing fluorescent bulbs with incandescent bulbs in cabin 12
  • Liutauras - dilithium crystal calibration
  • Devaka - alligator pit expansion
  • Devaka - undocked the command module from the secret mission module
  • Fix bug where similar threads option was broken on new thread boosts
  • Devaka - add one photon cannon to the runabout
  • Devaka - connect the lightning rod to the top of the clock tower
  • Devaka - upgrade aft shields
  • Devaka - robot goat army finally has actual targeting so THAT won't happen again
5 months ago
About $3.17/gallon here in Sri Lanka
5 months ago